Innovative developments in the selective removal and reuse of heavy metals from wastewaters

A.H.M. Veeken, W.H. Rulkens

Research output: Contribution to journalArticleAcademicpeer-review

38 Citations (Scopus)

Abstract

Sulphide precipitation of heavy metal containing wastewaters results in low effluent concentrations. However, sulphide precipitation is not widely applied in practice because the dosing of sulphide cannot adequately be controlled. A new process was developed where the combination of a sulphide-selective electrode (pS-electrode) and pH electrode controls the sulphide addition. Precipitation experiments were performed on a laboratory-scale in batch and continuous reactor systems with synthetic wastewaters containing Cd, Cu, Ni, Pb or Zn
Sulphide precipitation of heavy metal containing wastewaters results in low effluent concentrations. However, sulphide precipitation is not widely applied in practice because the dosing of sulphide cannot adequately be controlled. A new process was developed where the combination of a sulphide-selective electrode (pS-electrode) and pH electrode controls the sulphide addition. Precipitation experiments were performed on a laboratory-scale in batch and continuous reactor systems with synthetic wastewaters containing Cd, Cu, Ni, Pb or Zn. The response of the pS-electrode during precipitation was unique for each heavy metal and was directly related to the solubility product of the corresponding metal sulphide. The metals were removed to levels
Original languageEnglish
Pages (from-to)9-16
JournalWater Science and Technology
Volume47
Issue number10
DOIs
Publication statusPublished - 2003

Keywords

  • heavy metals
  • waste water treatment
  • water treatment
  • chemical precipitation
  • removal
  • sulfides
  • waste water
  • selectivity
  • solubility

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